Finding the Fourth Proportional to 98,781.72, 136,317.72 and 53,458.71

Step by Step Solution

1. Step 1: Write the proportion equation
   98,781.72 : 136,317.72 = 53,458.71 : x
2. Step 2: Convert to fraction form
   98,781.72/136,317.72 = 53,458.71/x
3. Step 3: Cross multiply
   98,781.72x = 136,317.72 × 53,458.71
4. Step 4: Simplify right side
   98,781.72x = 7,287,369,461.34
5. Step 5: Solve for x
   x = 7,287,369,461.34/98,781.72
6. Step 6: Final answer
   x = 73,772.45