Finding the Fourth Proportional to 31,128.72, 46,693.49 and 9,780.74

Step by Step Solution

1. Step 1: Write the proportion equation
   31,128.72 : 46,693.49 = 9,780.74 : x
2. Step 2: Convert to fraction form
   31,128.72/46,693.49 = 9,780.74/x
3. Step 3: Cross multiply
   31,128.72x = 46,693.49 × 9,780.74
4. Step 4: Simplify right side
   31,128.72x = 456,696,603.01
5. Step 5: Solve for x
   x = 456,696,603.01/31,128.72
6. Step 6: Final answer
   x = 14,671.23