Finding the Fourth Proportional to 1,557.52, 2,142.01 and 1,239.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,557.52 : 2,142.01 = 1,239.04 : x
2. Step 2: Convert to fraction form
   1,557.52/2,142.01 = 1,239.04/x
3. Step 3: Cross multiply
   1,557.52x = 2,142.01 × 1,239.04
4. Step 4: Simplify right side
   1,557.52x = 2,654,036.07
5. Step 5: Solve for x
   x = 2,654,036.07/1,557.52
6. Step 6: Final answer
   x = 1,704.01