Finding the Fourth Proportional to 42,003.60, 63,016.13 and 13,931.49

Step by Step Solution

1. Step 1: Write the proportion equation
   42,003.60 : 63,016.13 = 13,931.49 : x
2. Step 2: Convert to fraction form
   42,003.60/63,016.13 = 13,931.49/x
3. Step 3: Cross multiply
   42,003.60x = 63,016.13 × 13,931.49
4. Step 4: Simplify right side
   42,003.60x = 877,908,856.07
5. Step 5: Solve for x
   x = 877,908,856.07/42,003.60
6. Step 6: Final answer
   x = 20,900.80