Finding the Fourth Proportional to 1,210,654.24, 1,670,778.72 and 666,789.92

Step by Step Solution

1. Step 1: Write the proportion equation
   1,210,654.24 : 1,670,778.72 = 666,789.92 : x
2. Step 2: Convert to fraction form
   1,210,654.24/1,670,778.72 = 666,789.92/x
3. Step 3: Cross multiply
   1,210,654.24x = 1,670,778.72 × 666,789.92
4. Step 4: Simplify right side
   1,210,654.24x = 1,114,058,409,046.50
5. Step 5: Solve for x
   x = 1,114,058,409,046.50/1,210,654.24
6. Step 6: Final answer
   x = 920,211.88