Finding the Fourth Proportional to 1,587.93, 2,385.54 and 939.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,587.93 : 2,385.54 = 939.12 : x
2. Step 2: Convert to fraction form
   1,587.93/2,385.54 = 939.12/x
3. Step 3: Cross multiply
   1,587.93x = 2,385.54 × 939.12
4. Step 4: Simplify right side
   1,587.93x = 2,240,308.32
5. Step 5: Solve for x
   x = 2,240,308.32/1,587.93
6. Step 6: Final answer
   x = 1,410.84