Finding the Fourth Proportional to 42,965.80, 64,443.89 and 13,381.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42,965.80 : 64,443.89 = 13,381.16 : x
2. Step 2: Convert to fraction form
   42,965.80/64,443.89 = 13,381.16/x
3. Step 3: Cross multiply
   42,965.80x = 64,443.89 × 13,381.16
4. Step 4: Simplify right side
   42,965.80x = 862,333,714.35
5. Step 5: Solve for x
   x = 862,333,714.35/42,965.80
6. Step 6: Final answer
   x = 20,070.24