Finding the Fourth Proportional to 43,146.30, 64,719.40 and 13,566.72

Step by Step Solution

1. Step 1: Write the proportion equation
   43,146.30 : 64,719.40 = 13,566.72 : x
2. Step 2: Convert to fraction form
   43,146.30/64,719.40 = 13,566.72/x
3. Step 3: Cross multiply
   43,146.30x = 64,719.40 × 13,566.72
4. Step 4: Simplify right side
   43,146.30x = 878,029,978.37
5. Step 5: Solve for x
   x = 878,029,978.37/43,146.30
6. Step 6: Final answer
   x = 20,350.06