Finding the Fourth Proportional to 99,648.87, 148,838.27 and 90,146.62

Step by Step Solution

1. Step 1: Write the proportion equation
   99,648.87 : 148,838.27 = 90,146.62 : x
2. Step 2: Convert to fraction form
   99,648.87/148,838.27 = 90,146.62/x
3. Step 3: Cross multiply
   99,648.87x = 148,838.27 × 90,146.62
4. Step 4: Simplify right side
   99,648.87x = 13,417,266,967.15
5. Step 5: Solve for x
   x = 13,417,266,967.15/99,648.87
6. Step 6: Final answer
   x = 134,645.45