Finding the Fourth Proportional to 689,114.50, 950,978.04 and 387,308.50

Step by Step Solution

1. Step 1: Write the proportion equation
   689,114.50 : 950,978.04 = 387,308.50 : x
2. Step 2: Convert to fraction form
   689,114.50/950,978.04 = 387,308.50/x
3. Step 3: Cross multiply
   689,114.50x = 950,978.04 × 387,308.50
4. Step 4: Simplify right side
   689,114.50x = 368,321,878,205.34
5. Step 5: Solve for x
   x = 368,321,878,205.34/689,114.50
6. Step 6: Final answer
   x = 534,485.75