Finding the Fourth Proportional to 1,513.61, 2,088.87 and 1,139.93

Step by Step Solution

1. Step 1: Write the proportion equation
   1,513.61 : 2,088.87 = 1,139.93 : x
2. Step 2: Convert to fraction form
   1,513.61/2,088.87 = 1,139.93/x
3. Step 3: Cross multiply
   1,513.61x = 2,088.87 × 1,139.93
4. Step 4: Simplify right side
   1,513.61x = 2,381,155.13
5. Step 5: Solve for x
   x = 2,381,155.13/1,513.61
6. Step 6: Final answer
   x = 1,573.17