Finding the Fourth Proportional to 42,978.04, 64,476.24 and 13,395.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,978.04 : 64,476.24 = 13,395.22 : x
2. Step 2: Convert to fraction form
   42,978.04/64,476.24 = 13,395.22/x
3. Step 3: Cross multiply
   42,978.04x = 64,476.24 × 13,395.22
4. Step 4: Simplify right side
   42,978.04x = 863,673,419.57
5. Step 5: Solve for x
   x = 863,673,419.57/42,978.04
6. Step 6: Final answer
   x = 20,095.69