Finding the Fourth Proportional to 42,995.57, 64,500.93 and 13,406.04

Step by Step Solution

1. Step 1: Write the proportion equation
   42,995.57 : 64,500.93 = 13,406.04 : x
2. Step 2: Convert to fraction form
   42,995.57/64,500.93 = 13,406.04/x
3. Step 3: Cross multiply
   42,995.57x = 64,500.93 × 13,406.04
4. Step 4: Simplify right side
   42,995.57x = 864,702,047.62
5. Step 5: Solve for x
   x = 864,702,047.62/42,995.57
6. Step 6: Final answer
   x = 20,111.42