Finding the Fourth Proportional to 1,114.78, 1,671.90 and 498.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,114.78 : 1,671.90 = 498.15 : x
2. Step 2: Convert to fraction form
   1,114.78/1,671.90 = 498.15/x
3. Step 3: Cross multiply
   1,114.78x = 1,671.90 × 498.15
4. Step 4: Simplify right side
   1,114.78x = 832,856.99
5. Step 5: Solve for x
   x = 832,856.99/1,114.78
6. Step 6: Final answer
   x = 747.10