Finding the Fourth Proportional to 12,962.85, 19,435.90 and 7,117.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,962.85 : 19,435.90 = 7,117.89 : x
2. Step 2: Convert to fraction form
   12,962.85/19,435.90 = 7,117.89/x
3. Step 3: Cross multiply
   12,962.85x = 19,435.90 × 7,117.89
4. Step 4: Simplify right side
   12,962.85x = 138,342,598.25
5. Step 5: Solve for x
   x = 138,342,598.25/12,962.85
6. Step 6: Final answer
   x = 10,672.24