Finding the Fourth Proportional to 1,139.94, 1,573.31 and 1,088.00

Step by Step Solution

1. Step 1: Write the proportion equation
   1,139.94 : 1,573.31 = 1,088.00 : x
2. Step 2: Convert to fraction form
   1,139.94/1,573.31 = 1,088.00/x
3. Step 3: Cross multiply
   1,139.94x = 1,573.31 × 1,088.00
4. Step 4: Simplify right side
   1,139.94x = 1,711,756.13
5. Step 5: Solve for x
   x = 1,711,756.13/1,139.94
6. Step 6: Final answer
   x = 1,501.62