Finding the Fourth Proportional to 1,391.61, 2,088.18 and 742.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,391.61 : 2,088.18 = 742.32 : x
2. Step 2: Convert to fraction form
   1,391.61/2,088.18 = 742.32/x
3. Step 3: Cross multiply
   1,391.61x = 2,088.18 × 742.32
4. Step 4: Simplify right side
   1,391.61x = 1,550,097.78
5. Step 5: Solve for x
   x = 1,550,097.78/1,391.61
6. Step 6: Final answer
   x = 1,113.89