Finding the Fourth Proportional to 12,974.31, 17,904.78 and 7,385.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,974.31 : 17,904.78 = 7,385.31 : x
2. Step 2: Convert to fraction form
   12,974.31/17,904.78 = 7,385.31/x
3. Step 3: Cross multiply
   12,974.31x = 17,904.78 × 7,385.31
4. Step 4: Simplify right side
   12,974.31x = 132,232,350.78
5. Step 5: Solve for x
   x = 132,232,350.78/12,974.31
6. Step 6: Final answer
   x = 10,191.86