Finding the Fourth Proportional to 42,690.57, 64,030.18 and 12,704.27

Step by Step Solution

1. Step 1: Write the proportion equation
   42,690.57 : 64,030.18 = 12,704.27 : x
2. Step 2: Convert to fraction form
   42,690.57/64,030.18 = 12,704.27/x
3. Step 3: Cross multiply
   42,690.57x = 64,030.18 × 12,704.27
4. Step 4: Simplify right side
   42,690.57x = 813,456,470.64
5. Step 5: Solve for x
   x = 813,456,470.64/42,690.57
6. Step 6: Final answer
   x = 19,054.71