Finding the Fourth Proportional to 42,870.72, 64,324.56 and 23,145.36

Step by Step Solution

1. Step 1: Write the proportion equation
   42,870.72 : 64,324.56 = 23,145.36 : x
2. Step 2: Convert to fraction form
   42,870.72/64,324.56 = 23,145.36/x
3. Step 3: Cross multiply
   42,870.72x = 64,324.56 × 23,145.36
4. Step 4: Simplify right side
   42,870.72x = 1,488,815,098.04
5. Step 5: Solve for x
   x = 1,488,815,098.04/42,870.72
6. Step 6: Final answer
   x = 34,728.02