Finding the Fourth Proportional to 42,942.84, 64,422.18 and 13,358.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42,942.84 : 64,422.18 = 13,358.76 : x
2. Step 2: Convert to fraction form
   42,942.84/64,422.18 = 13,358.76/x
3. Step 3: Cross multiply
   42,942.84x = 64,422.18 × 13,358.76
4. Step 4: Simplify right side
   42,942.84x = 860,600,441.30
5. Step 5: Solve for x
   x = 860,600,441.30/42,942.84
6. Step 6: Final answer
   x = 20,040.60