Finding the Fourth Proportional to 928,961.34, 1,391,078.49 and 612,457.98

Step by Step Solution

1. Step 1: Write the proportion equation
   928,961.34 : 1,391,078.49 = 612,457.98 : x
2. Step 2: Convert to fraction form
   928,961.34/1,391,078.49 = 612,457.98/x
3. Step 3: Cross multiply
   928,961.34x = 1,391,078.49 × 612,457.98
4. Step 4: Simplify right side
   928,961.34x = 851,977,122,006.85
5. Step 5: Solve for x
   x = 851,977,122,006.85/928,961.34
6. Step 6: Final answer
   x = 917,128.72