Finding the Fourth Proportional to 501,978.06, 692,473.05 and 320,499.18

Step by Step Solution

1. Step 1: Write the proportion equation
   501,978.06 : 692,473.05 = 320,499.18 : x
2. Step 2: Convert to fraction form
   501,978.06/692,473.05 = 320,499.18/x
3. Step 3: Cross multiply
   501,978.06x = 692,473.05 × 320,499.18
4. Step 4: Simplify right side
   501,978.06x = 221,937,044,697.10
5. Step 5: Solve for x
   x = 221,937,044,697.10/501,978.06
6. Step 6: Final answer
   x = 442,124.99