Finding the Fourth Proportional to 42,290.37, 63,443.93 and 18,917.01

Step by Step Solution

1. Step 1: Write the proportion equation
   42,290.37 : 63,443.93 = 18,917.01 : x
2. Step 2: Convert to fraction form
   42,290.37/63,443.93 = 18,917.01/x
3. Step 3: Cross multiply
   42,290.37x = 63,443.93 × 18,917.01
4. Step 4: Simplify right side
   42,290.37x = 1,200,169,363.66
5. Step 5: Solve for x
   x = 1,200,169,363.66/42,290.37
6. Step 6: Final answer
   x = 28,379.26