Finding the Fourth Proportional to 42,940.06, 64,421.06 and 13,358.14

Step by Step Solution

1. Step 1: Write the proportion equation
   42,940.06 : 64,421.06 = 13,358.14 : x
2. Step 2: Convert to fraction form
   42,940.06/64,421.06 = 13,358.14/x
3. Step 3: Cross multiply
   42,940.06x = 64,421.06 × 13,358.14
4. Step 4: Simplify right side
   42,940.06x = 860,545,310.59
5. Step 5: Solve for x
   x = 860,545,310.59/42,940.06
6. Step 6: Final answer
   x = 20,040.62