Finding the Fourth Proportional to 42,072.15, 63,117.51 and 12,488.22

Step by Step Solution

1. Step 1: Write the proportion equation
   42,072.15 : 63,117.51 = 12,488.22 : x
2. Step 2: Convert to fraction form
   42,072.15/63,117.51 = 12,488.22/x
3. Step 3: Cross multiply
   42,072.15x = 63,117.51 × 12,488.22
4. Step 4: Simplify right side
   42,072.15x = 788,225,350.73
5. Step 5: Solve for x
   x = 788,225,350.73/42,072.15
6. Step 6: Final answer
   x = 18,735.09