Finding the Fourth Proportional to 12,958.99, 17,875.08 and 7,920.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,958.99 : 17,875.08 = 7,920.38 : x
2. Step 2: Convert to fraction form
   12,958.99/17,875.08 = 7,920.38/x
3. Step 3: Cross multiply
   12,958.99x = 17,875.08 × 7,920.38
4. Step 4: Simplify right side
   12,958.99x = 141,577,470.82
5. Step 5: Solve for x
   x = 141,577,470.82/12,958.99
6. Step 6: Final answer
   x = 10,925.04