Finding the Fourth Proportional to 42,921.42, 64,355.47 and 17,930.84

Step by Step Solution

1. Step 1: Write the proportion equation
   42,921.42 : 64,355.47 = 17,930.84 : x
2. Step 2: Convert to fraction form
   42,921.42/64,355.47 = 17,930.84/x
3. Step 3: Cross multiply
   42,921.42x = 64,355.47 × 17,930.84
4. Step 4: Simplify right side
   42,921.42x = 1,153,947,635.69
5. Step 5: Solve for x
   x = 1,153,947,635.69/42,921.42
6. Step 6: Final answer
   x = 26,885.12