Finding the Fourth Proportional to 777,105, 1,165,723.52 and 216,139.50

Step by Step Solution

1. Step 1: Write the proportion equation
   777,105 : 1,165,723.52 = 216,139.50 : x
2. Step 2: Convert to fraction form
   777,105/1,165,723.52 = 216,139.50/x
3. Step 3: Cross multiply
   777,105x = 1,165,723.52 × 216,139.50
4. Step 4: Simplify right side
   777,105x = 251,958,897,670.34
5. Step 5: Solve for x
   x = 251,958,897,670.34/777,105
6. Step 6: Final answer
   x = 324,227.61