Finding the Fourth Proportional to 403,002.31, 556,143.18 and 221,710.34

Step by Step Solution

1. Step 1: Write the proportion equation
   403,002.31 : 556,143.18 = 221,710.34 : x
2. Step 2: Convert to fraction form
   403,002.31/556,143.18 = 221,710.34/x
3. Step 3: Cross multiply
   403,002.31x = 556,143.18 × 221,710.34
4. Step 4: Simplify right side
   403,002.31x = 123,302,693,526.48
5. Step 5: Solve for x
   x = 123,302,693,526.48/403,002.31
6. Step 6: Final answer
   x = 305,960.26