Finding the Fourth Proportional to 118,399, 163,390.62 and 65,407

Step by Step Solution

1. Step 1: Write the proportion equation
   118,399 : 163,390.62 = 65,407 : x
2. Step 2: Convert to fraction form
   118,399/163,390.62 = 65,407/x
3. Step 3: Cross multiply
   118,399x = 163,390.62 × 65,407
4. Step 4: Simplify right side
   118,399x = 10,686,890,282.34
5. Step 5: Solve for x
   x = 10,686,890,282.34/118,399
6. Step 6: Final answer
   x = 90,261.66