Finding the Fourth Proportional to 103,729.69, 142,845.78 and 90,111.52

Step by Step Solution

1. Step 1: Write the proportion equation
   103,729.69 : 142,845.78 = 90,111.52 : x
2. Step 2: Convert to fraction form
   103,729.69/142,845.78 = 90,111.52/x
3. Step 3: Cross multiply
   103,729.69x = 142,845.78 × 90,111.52
4. Step 4: Simplify right side
   103,729.69x = 12,872,050,361.39
5. Step 5: Solve for x
   x = 12,872,050,361.39/103,729.69
6. Step 6: Final answer
   x = 124,092.25