Finding the Fourth Proportional to 1,925.76, 2,656.28 and 1,139.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,925.76 : 2,656.28 = 1,139.24 : x
2. Step 2: Convert to fraction form
   1,925.76/2,656.28 = 1,139.24/x
3. Step 3: Cross multiply
   1,925.76x = 2,656.28 × 1,139.24
4. Step 4: Simplify right side
   1,925.76x = 3,026,140.43
5. Step 5: Solve for x
   x = 3,026,140.43/1,925.76
6. Step 6: Final answer
   x = 1,571.40