Finding the Fourth Proportional to 913,123.05, 1,260,146.88 and 505,218.27

Step by Step Solution

1. Step 1: Write the proportion equation
   913,123.05 : 1,260,146.88 = 505,218.27 : x
2. Step 2: Convert to fraction form
   913,123.05/1,260,146.88 = 505,218.27/x
3. Step 3: Cross multiply
   913,123.05x = 1,260,146.88 × 505,218.27
4. Step 4: Simplify right side
   913,123.05x = 636,649,226,659.50
5. Step 5: Solve for x
   x = 636,649,226,659.50/913,123.05
6. Step 6: Final answer
   x = 697,221.72