Finding the Fourth Proportional to 91,977.48, 138,005.10 and 39,411.72

Step by Step Solution

1. Step 1: Write the proportion equation
   91,977.48 : 138,005.10 = 39,411.72 : x
2. Step 2: Convert to fraction form
   91,977.48/138,005.10 = 39,411.72/x
3. Step 3: Cross multiply
   91,977.48x = 138,005.10 × 39,411.72
4. Step 4: Simplify right side
   91,977.48x = 5,439,018,359.77
5. Step 5: Solve for x
   x = 5,439,018,359.77/91,977.48
6. Step 6: Final answer
   x = 59,134.24