Finding the Fourth Proportional to 99,144.61, 148,387.93 and 90,280.34

Step by Step Solution

1. Step 1: Write the proportion equation
   99,144.61 : 148,387.93 = 90,280.34 : x
2. Step 2: Convert to fraction form
   99,144.61/148,387.93 = 90,280.34/x
3. Step 3: Cross multiply
   99,144.61x = 148,387.93 × 90,280.34
4. Step 4: Simplify right side
   99,144.61x = 13,396,512,868.94
5. Step 5: Solve for x
   x = 13,396,512,868.94/99,144.61
6. Step 6: Final answer
   x = 135,120.94