Finding the Fourth Proportional to 103,755.68, 142,881.34 and 90,137.50

Step by Step Solution

1. Step 1: Write the proportion equation
   103,755.68 : 142,881.34 = 90,137.50 : x
2. Step 2: Convert to fraction form
   103,755.68/142,881.34 = 90,137.50/x
3. Step 3: Cross multiply
   103,755.68x = 142,881.34 × 90,137.50
4. Step 4: Simplify right side
   103,755.68x = 12,878,966,784.25
5. Step 5: Solve for x
   x = 12,878,966,784.25/103,755.68
6. Step 6: Final answer
   x = 124,127.83