Finding the Fourth Proportional to 400,775.98, 553,071.71 and 217,016.56

Step by Step Solution

1. Step 1: Write the proportion equation
   400,775.98 : 553,071.71 = 217,016.56 : x
2. Step 2: Convert to fraction form
   400,775.98/553,071.71 = 217,016.56/x
3. Step 3: Cross multiply
   400,775.98x = 553,071.71 × 217,016.56
4. Step 4: Simplify right side
   400,775.98x = 120,025,719,937.52
5. Step 5: Solve for x
   x = 120,025,719,937.52/400,775.98
6. Step 6: Final answer
   x = 299,483.32