Finding the Fourth Proportional to 99,665.34, 149,328.84 and 60,139.40

Step by Step Solution

1. Step 1: Write the proportion equation
   99,665.34 : 149,328.84 = 60,139.40 : x
2. Step 2: Convert to fraction form
   99,665.34/149,328.84 = 60,139.40/x
3. Step 3: Cross multiply
   99,665.34x = 149,328.84 × 60,139.40
4. Step 4: Simplify right side
   99,665.34x = 8,980,546,840.30
5. Step 5: Solve for x
   x = 8,980,546,840.30/99,665.34
6. Step 6: Final answer
   x = 90,107.02