Finding the Fourth Proportional to 1,115.91, 1,539.72 and 762.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,115.91 : 1,539.72 = 762.10 : x
2. Step 2: Convert to fraction form
   1,115.91/1,539.72 = 762.10/x
3. Step 3: Cross multiply
   1,115.91x = 1,539.72 × 762.10
4. Step 4: Simplify right side
   1,115.91x = 1,173,420.61
5. Step 5: Solve for x
   x = 1,173,420.61/1,115.91
6. Step 6: Final answer
   x = 1,051.54