Finding the Fourth Proportional to 100,197, 138,271.86 and 55,485

Step by Step Solution

1. Step 1: Write the proportion equation
   100,197 : 138,271.86 = 55,485 : x
2. Step 2: Convert to fraction form
   100,197/138,271.86 = 55,485/x
3. Step 3: Cross multiply
   100,197x = 138,271.86 × 55,485
4. Step 4: Simplify right side
   100,197x = 7,672,014,152.10
5. Step 5: Solve for x
   x = 7,672,014,152.10/100,197
6. Step 6: Final answer
   x = 76,569.30