Finding the Fourth Proportional to 1,061.10, 1,588.51 and 788.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,061.10 : 1,588.51 = 788.40 : x
2. Step 2: Convert to fraction form
   1,061.10/1,588.51 = 788.40/x
3. Step 3: Cross multiply
   1,061.10x = 1,588.51 × 788.40
4. Step 4: Simplify right side
   1,061.10x = 1,252,382.27
5. Step 5: Solve for x
   x = 1,252,382.27/1,061.10
6. Step 6: Final answer
   x = 1,180.27