Finding the Fourth Proportional to 1,039.29, 1,567.91 and 988.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,039.29 : 1,567.91 = 988.05 : x
2. Step 2: Convert to fraction form
   1,039.29/1,567.91 = 988.05/x
3. Step 3: Cross multiply
   1,039.29x = 1,567.91 × 988.05
4. Step 4: Simplify right side
   1,039.29x = 1,549,173.48
5. Step 5: Solve for x
   x = 1,549,173.48/1,039.29
6. Step 6: Final answer
   x = 1,490.61