Finding the Fourth Proportional to 518,630.10, 779,111.55 and 498,801.30

Step by Step Solution

1. Step 1: Write the proportion equation
   518,630.10 : 779,111.55 = 498,801.30 : x
2. Step 2: Convert to fraction form
   518,630.10/779,111.55 = 498,801.30/x
3. Step 3: Cross multiply
   518,630.10x = 779,111.55 × 498,801.30
4. Step 4: Simplify right side
   518,630.10x = 388,621,853,985.02
5. Step 5: Solve for x
   x = 388,621,853,985.02/518,630.10
6. Step 6: Final answer
   x = 749,323.75