Finding the Fourth Proportional to 42,973.57, 64,460.37 and 13,393.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,973.57 : 64,460.37 = 13,393.79 : x
2. Step 2: Convert to fraction form
   42,973.57/64,460.37 = 13,393.79/x
3. Step 3: Cross multiply
   42,973.57x = 64,460.37 × 13,393.79
4. Step 4: Simplify right side
   42,973.57x = 863,368,628.75
5. Step 5: Solve for x
   x = 863,368,628.75/42,973.57
6. Step 6: Final answer
   x = 20,090.69