Finding the Fourth Proportional to 553,538.72, 763,880.06 and 311,899.12

Step by Step Solution

1. Step 1: Write the proportion equation
   553,538.72 : 763,880.06 = 311,899.12 : x
2. Step 2: Convert to fraction form
   553,538.72/763,880.06 = 311,899.12/x
3. Step 3: Cross multiply
   553,538.72x = 763,880.06 × 311,899.12
4. Step 4: Simplify right side
   553,538.72x = 238,253,518,499.55
5. Step 5: Solve for x
   x = 238,253,518,499.55/553,538.72
6. Step 6: Final answer
   x = 430,418.88