Finding the Fourth Proportional to 42,066.05, 63,085.42 and 13,978.56

Step by Step Solution

1. Step 1: Write the proportion equation
   42,066.05 : 63,085.42 = 13,978.56 : x
2. Step 2: Convert to fraction form
   42,066.05/63,085.42 = 13,978.56/x
3. Step 3: Cross multiply
   42,066.05x = 63,085.42 × 13,978.56
4. Step 4: Simplify right side
   42,066.05x = 881,843,328.60
5. Step 5: Solve for x
   x = 881,843,328.60/42,066.05
6. Step 6: Final answer
   x = 20,963.30