Finding the Fourth Proportional to 1,925.10, 2,656.29 and 1,139.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,925.10 : 2,656.29 = 1,139.10 : x
2. Step 2: Convert to fraction form
   1,925.10/2,656.29 = 1,139.10/x
3. Step 3: Cross multiply
   1,925.10x = 2,656.29 × 1,139.10
4. Step 4: Simplify right side
   1,925.10x = 3,025,779.94
5. Step 5: Solve for x
   x = 3,025,779.94/1,925.10
6. Step 6: Final answer
   x = 1,571.75