Finding the Fourth Proportional to 42,931.42, 64,397.67 and 13,348.60

Step by Step Solution

1. Step 1: Write the proportion equation
   42,931.42 : 64,397.67 = 13,348.60 : x
2. Step 2: Convert to fraction form
   42,931.42/64,397.67 = 13,348.60/x
3. Step 3: Cross multiply
   42,931.42x = 64,397.67 × 13,348.60
4. Step 4: Simplify right side
   42,931.42x = 859,618,737.76
5. Step 5: Solve for x
   x = 859,618,737.76/42,931.42
6. Step 6: Final answer
   x = 20,023.07