Finding the Fourth Proportional to 43,275.86, 64,920.52 and 13,690.88

Step by Step Solution

1. Step 1: Write the proportion equation
   43,275.86 : 64,920.52 = 13,690.88 : x
2. Step 2: Convert to fraction form
   43,275.86/64,920.52 = 13,690.88/x
3. Step 3: Cross multiply
   43,275.86x = 64,920.52 × 13,690.88
4. Step 4: Simplify right side
   43,275.86x = 888,819,048.86
5. Step 5: Solve for x
   x = 888,819,048.86/43,275.86
6. Step 6: Final answer
   x = 20,538.45