Finding the Fourth Proportional to 1,240.72, 1,861.31 and 591.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,240.72 : 1,861.31 = 591.50 : x
2. Step 2: Convert to fraction form
   1,240.72/1,861.31 = 591.50/x
3. Step 3: Cross multiply
   1,240.72x = 1,861.31 × 591.50
4. Step 4: Simplify right side
   1,240.72x = 1,100,971.00
5. Step 5: Solve for x
   x = 1,100,971.00/1,240.72
6. Step 6: Final answer
   x = 887.37