Finding the Fourth Proportional to 920,978.79, 1,380,307.86 and 493,454.31

Step by Step Solution

1. Step 1: Write the proportion equation
   920,978.79 : 1,380,307.86 = 493,454.31 : x
2. Step 2: Convert to fraction form
   920,978.79/1,380,307.86 = 493,454.31/x
3. Step 3: Cross multiply
   920,978.79x = 1,380,307.86 × 493,454.31
4. Step 4: Simplify right side
   920,978.79x = 681,118,862,643.88
5. Step 5: Solve for x
   x = 681,118,862,643.88/920,978.79
6. Step 6: Final answer
   x = 739,559.77