Finding the Fourth Proportional to 43,002.59, 64,514.81 and 13,420.67

Step by Step Solution

1. Step 1: Write the proportion equation
   43,002.59 : 64,514.81 = 13,420.67 : x
2. Step 2: Convert to fraction form
   43,002.59/64,514.81 = 13,420.67/x
3. Step 3: Cross multiply
   43,002.59x = 64,514.81 × 13,420.67
4. Step 4: Simplify right side
   43,002.59x = 865,831,585.45
5. Step 5: Solve for x
   x = 865,831,585.45/43,002.59
6. Step 6: Final answer
   x = 20,134.41