Finding the Fourth Proportional to 6,402.31, 9,607.11 and 5,111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   6,402.31 : 9,607.11 = 5,111.98 : x
2. Step 2: Convert to fraction form
   6,402.31/9,607.11 = 5,111.98/x
3. Step 3: Cross multiply
   6,402.31x = 9,607.11 × 5,111.98
4. Step 4: Simplify right side
   6,402.31x = 49,111,310.99
5. Step 5: Solve for x
   x = 49,111,310.99/6,402.31
6. Step 6: Final answer
   x = 7,670.88