Finding the Fourth Proportional to 42,924.96, 64,393.38 and 13,345.20

Step by Step Solution

1. Step 1: Write the proportion equation
   42,924.96 : 64,393.38 = 13,345.20 : x
2. Step 2: Convert to fraction form
   42,924.96/64,393.38 = 13,345.20/x
3. Step 3: Cross multiply
   42,924.96x = 64,393.38 × 13,345.20
4. Step 4: Simplify right side
   42,924.96x = 859,342,534.78
5. Step 5: Solve for x
   x = 859,342,534.78/42,924.96
6. Step 6: Final answer
   x = 20,019.65