Finding the Fourth Proportional to 1,152.55, 1,580.16 and 1,131.79

Step by Step Solution

1. Step 1: Write the proportion equation
   1,152.55 : 1,580.16 = 1,131.79 : x
2. Step 2: Convert to fraction form
   1,152.55/1,580.16 = 1,131.79/x
3. Step 3: Cross multiply
   1,152.55x = 1,580.16 × 1,131.79
4. Step 4: Simplify right side
   1,152.55x = 1,788,409.29
5. Step 5: Solve for x
   x = 1,788,409.29/1,152.55
6. Step 6: Final answer
   x = 1,551.70