Finding the Fourth Proportional to 98,945.78, 136,538.42 and 63,131.83

Step by Step Solution

1. Step 1: Write the proportion equation
   98,945.78 : 136,538.42 = 63,131.83 : x
2. Step 2: Convert to fraction form
   98,945.78/136,538.42 = 63,131.83/x
3. Step 3: Cross multiply
   98,945.78x = 136,538.42 × 63,131.83
4. Step 4: Simplify right side
   98,945.78x = 8,619,919,662.90
5. Step 5: Solve for x
   x = 8,619,919,662.90/98,945.78
6. Step 6: Final answer
   x = 87,117.61