Finding the Fourth Proportional to 99,516.54, 148,864.71 and 90,757.59

Step by Step Solution

1. Step 1: Write the proportion equation
   99,516.54 : 148,864.71 = 90,757.59 : x
2. Step 2: Convert to fraction form
   99,516.54/148,864.71 = 90,757.59/x
3. Step 3: Cross multiply
   99,516.54x = 148,864.71 × 90,757.59
4. Step 4: Simplify right side
   99,516.54x = 13,510,602,315.65
5. Step 5: Solve for x
   x = 13,510,602,315.65/99,516.54
6. Step 6: Final answer
   x = 135,762.38