Finding the Fourth Proportional to 13,219.41, 18,242.18 and 7,917.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,219.41 : 18,242.18 = 7,917.15 : x
2. Step 2: Convert to fraction form
   13,219.41/18,242.18 = 7,917.15/x
3. Step 3: Cross multiply
   13,219.41x = 18,242.18 × 7,917.15
4. Step 4: Simplify right side
   13,219.41x = 144,426,035.80
5. Step 5: Solve for x
   x = 144,426,035.80/13,219.41
6. Step 6: Final answer
   x = 10,925.30