Finding the Fourth Proportional to 43,300.86, 64,943.96 and 12,128.94

Step by Step Solution

1. Step 1: Write the proportion equation
   43,300.86 : 64,943.96 = 12,128.94 : x
2. Step 2: Convert to fraction form
   43,300.86/64,943.96 = 12,128.94/x
3. Step 3: Cross multiply
   43,300.86x = 64,943.96 × 12,128.94
4. Step 4: Simplify right side
   43,300.86x = 787,701,099.80
5. Step 5: Solve for x
   x = 787,701,099.80/43,300.86
6. Step 6: Final answer
   x = 18,191.35