Finding the Fourth Proportional to 111,868.57, 154,385.51 and 64,129.09

Step by Step Solution

1. Step 1: Write the proportion equation
   111,868.57 : 154,385.51 = 64,129.09 : x
2. Step 2: Convert to fraction form
   111,868.57/154,385.51 = 64,129.09/x
3. Step 3: Cross multiply
   111,868.57x = 154,385.51 × 64,129.09
4. Step 4: Simplify right side
   111,868.57x = 9,900,601,992.34
5. Step 5: Solve for x
   x = 9,900,601,992.34/111,868.57
6. Step 6: Final answer
   x = 88,502.09