Finding the Fourth Proportional to 1,079.86, 1,490.16 and 607.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,079.86 : 1,490.16 = 607.72 : x
2. Step 2: Convert to fraction form
   1,079.86/1,490.16 = 607.72/x
3. Step 3: Cross multiply
   1,079.86x = 1,490.16 × 607.72
4. Step 4: Simplify right side
   1,079.86x = 905,600.04
5. Step 5: Solve for x
   x = 905,600.04/1,079.86
6. Step 6: Final answer
   x = 838.63