Finding the Fourth Proportional to 11,878.79, 17,818.76 and 3,113.71

Step by Step Solution

1. Step 1: Write the proportion equation
   11,878.79 : 17,818.76 = 3,113.71 : x
2. Step 2: Convert to fraction form
   11,878.79/17,818.76 = 3,113.71/x
3. Step 3: Cross multiply
   11,878.79x = 17,818.76 × 3,113.71
4. Step 4: Simplify right side
   11,878.79x = 55,482,451.20
5. Step 5: Solve for x
   x = 55,482,451.20/11,878.79
6. Step 6: Final answer
   x = 4,670.72