Finding the Fourth Proportional to 42,808.31, 64,225.40 and 12,823.52

Step by Step Solution

1. Step 1: Write the proportion equation
   42,808.31 : 64,225.40 = 12,823.52 : x
2. Step 2: Convert to fraction form
   42,808.31/64,225.40 = 12,823.52/x
3. Step 3: Cross multiply
   42,808.31x = 64,225.40 × 12,823.52
4. Step 4: Simplify right side
   42,808.31x = 823,595,637.29
5. Step 5: Solve for x
   x = 823,595,637.29/42,808.31
6. Step 6: Final answer
   x = 19,239.15