Finding the Fourth Proportional to 103,757.58, 143,128.89 and 90,305.10

Step by Step Solution

1. Step 1: Write the proportion equation
   103,757.58 : 143,128.89 = 90,305.10 : x
2. Step 2: Convert to fraction form
   103,757.58/143,128.89 = 90,305.10/x
3. Step 3: Cross multiply
   103,757.58x = 143,128.89 × 90,305.10
4. Step 4: Simplify right side
   103,757.58x = 12,925,268,724.34
5. Step 5: Solve for x
   x = 12,925,268,724.34/103,757.58
6. Step 6: Final answer
   x = 124,571.80