Finding the Fourth Proportional to 42,109.61, 63,131.27 and 21,038.81

Step by Step Solution

1. Step 1: Write the proportion equation
   42,109.61 : 63,131.27 = 21,038.81 : x
2. Step 2: Convert to fraction form
   42,109.61/63,131.27 = 21,038.81/x
3. Step 3: Cross multiply
   42,109.61x = 63,131.27 × 21,038.81
4. Step 4: Simplify right side
   42,109.61x = 1,328,206,373.74
5. Step 5: Solve for x
   x = 1,328,206,373.74/42,109.61
6. Step 6: Final answer
   x = 31,541.65