Finding the Fourth Proportional to 2,610.86, 3,915.30 and 761.36

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.86 : 3,915.30 = 761.36 : x
2. Step 2: Convert to fraction form
   2,610.86/3,915.30 = 761.36/x
3. Step 3: Cross multiply
   2,610.86x = 3,915.30 × 761.36
4. Step 4: Simplify right side
   2,610.86x = 2,980,952.81
5. Step 5: Solve for x
   x = 2,980,952.81/2,610.86
6. Step 6: Final answer
   x = 1,141.75