Finding the Fourth Proportional to 860,062, 1,290,365.16 and 386,788.72

Step by Step Solution

1. Step 1: Write the proportion equation
   860,062 : 1,290,365.16 = 386,788.72 : x
2. Step 2: Convert to fraction form
   860,062/1,290,365.16 = 386,788.72/x
3. Step 3: Cross multiply
   860,062x = 1,290,365.16 × 386,788.72
4. Step 4: Simplify right side
   860,062x = 499,098,688,569.00
5. Step 5: Solve for x
   x = 499,098,688,569.00/860,062
6. Step 6: Final answer
   x = 580,305.48