Finding the Fourth Proportional to 100,298.55, 149,563.87 and 99,399.15

Step by Step Solution

1. Step 1: Write the proportion equation
   100,298.55 : 149,563.87 = 99,399.15 : x
2. Step 2: Convert to fraction form
   100,298.55/149,563.87 = 99,399.15/x
3. Step 3: Cross multiply
   100,298.55x = 149,563.87 × 99,399.15
4. Step 4: Simplify right side
   100,298.55x = 14,866,521,300.21
5. Step 5: Solve for x
   x = 14,866,521,300.21/100,298.55
6. Step 6: Final answer
   x = 148,222.69