Finding the Fourth Proportional to 42,090.18, 63,147.78 and 12,508.98

Step by Step Solution

1. Step 1: Write the proportion equation
   42,090.18 : 63,147.78 = 12,508.98 : x
2. Step 2: Convert to fraction form
   42,090.18/63,147.78 = 12,508.98/x
3. Step 3: Cross multiply
   42,090.18x = 63,147.78 × 12,508.98
4. Step 4: Simplify right side
   42,090.18x = 789,914,317.06
5. Step 5: Solve for x
   x = 789,914,317.06/42,090.18
6. Step 6: Final answer
   x = 18,767.19