Finding the Fourth Proportional to 42,070.82, 63,105.75 and 12,085.79

Step by Step Solution

1. Step 1: Write the proportion equation
   42,070.82 : 63,105.75 = 12,085.79 : x
2. Step 2: Convert to fraction form
   42,070.82/63,105.75 = 12,085.79/x
3. Step 3: Cross multiply
   42,070.82x = 63,105.75 × 12,085.79
4. Step 4: Simplify right side
   42,070.82x = 762,683,147.96
5. Step 5: Solve for x
   x = 762,683,147.96/42,070.82
6. Step 6: Final answer
   x = 18,128.55