Finding the Fourth Proportional to 12,100.41, 18,139.68 and 4,307.40

Step by Step Solution

1. Step 1: Write the proportion equation
   12,100.41 : 18,139.68 = 4,307.40 : x
2. Step 2: Convert to fraction form
   12,100.41/18,139.68 = 4,307.40/x
3. Step 3: Cross multiply
   12,100.41x = 18,139.68 × 4,307.40
4. Step 4: Simplify right side
   12,100.41x = 78,134,926.82
5. Step 5: Solve for x
   x = 78,134,926.82/12,100.41
6. Step 6: Final answer
   x = 6,457.21