Finding the Fourth Proportional to 818,398.08, 1,129,392.72 and 478,800.72

Step by Step Solution

1. Step 1: Write the proportion equation
   818,398.08 : 1,129,392.72 = 478,800.72 : x
2. Step 2: Convert to fraction form
   818,398.08/1,129,392.72 = 478,800.72/x
3. Step 3: Cross multiply
   818,398.08x = 1,129,392.72 × 478,800.72
4. Step 4: Simplify right side
   818,398.08x = 540,754,047,498.76
5. Step 5: Solve for x
   x = 540,754,047,498.76/818,398.08
6. Step 6: Final answer
   x = 660,746.96