Finding the Fourth Proportional to 1,100.28, 1,649.86 and 515.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,100.28 : 1,649.86 = 515.12 : x
2. Step 2: Convert to fraction form
   1,100.28/1,649.86 = 515.12/x
3. Step 3: Cross multiply
   1,100.28x = 1,649.86 × 515.12
4. Step 4: Simplify right side
   1,100.28x = 849,875.88
5. Step 5: Solve for x
   x = 849,875.88/1,100.28
6. Step 6: Final answer
   x = 772.42