Finding the Fourth Proportional to 1,557.32, 2,150.70 and 1,292.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.32 : 2,150.70 = 1,292.72 : x
2. Step 2: Convert to fraction form
   1,557.32/2,150.70 = 1,292.72/x
3. Step 3: Cross multiply
   1,557.32x = 2,150.70 × 1,292.72
4. Step 4: Simplify right side
   1,557.32x = 2,780,252.90
5. Step 5: Solve for x
   x = 2,780,252.90/1,557.32
6. Step 6: Final answer
   x = 1,785.28