Finding the Fourth Proportional to 1,925.20, 2,657.32 and 1,139.52

Step by Step Solution

1. Step 1: Write the proportion equation
   1,925.20 : 2,657.32 = 1,139.52 : x
2. Step 2: Convert to fraction form
   1,925.20/2,657.32 = 1,139.52/x
3. Step 3: Cross multiply
   1,925.20x = 2,657.32 × 1,139.52
4. Step 4: Simplify right side
   1,925.20x = 3,028,069.29
5. Step 5: Solve for x
   x = 3,028,069.29/1,925.20
6. Step 6: Final answer
   x = 1,572.86