Finding the Fourth Proportional to 103,707.18, 142,814.73 and 90,088.99

Step by Step Solution

1. Step 1: Write the proportion equation
   103,707.18 : 142,814.73 = 90,088.99 : x
2. Step 2: Convert to fraction form
   103,707.18/142,814.73 = 90,088.99/x
3. Step 3: Cross multiply
   103,707.18x = 142,814.73 × 90,088.99
4. Step 4: Simplify right side
   103,707.18x = 12,866,034,782.82
5. Step 5: Solve for x
   x = 12,866,034,782.82/103,707.18
6. Step 6: Final answer
   x = 124,061.18