Finding the Fourth Proportional to 404,665,271.72, 607,019,982.30 and 128,296,498.36

Step by Step Solution

1. Step 1: Write the proportion equation
   404,665,271.72 : 607,019,982.30 = 128,296,498.36 : x
2. Step 2: Convert to fraction form
   404,665,271.72/607,019,982.30 = 128,296,498.36/x
3. Step 3: Cross multiply
   404,665,271.72x = 607,019,982.30 × 128,296,498.36
4. Step 4: Simplify right side
   404,665,271.72x = 77,878,538,163,639,168
5. Step 5: Solve for x
   x = 77,878,538,163,639,168/404,665,271.72
6. Step 6: Final answer
   x = 192,451,746.19