Finding the Fourth Proportional to 42,506.31, 63,771.81 and 18,813

Step by Step Solution

1. Step 1: Write the proportion equation
   42,506.31 : 63,771.81 = 18,813 : x
2. Step 2: Convert to fraction form
   42,506.31/63,771.81 = 18,813/x
3. Step 3: Cross multiply
   42,506.31x = 63,771.81 × 18,813
4. Step 4: Simplify right side
   42,506.31x = 1,199,739,061.53
5. Step 5: Solve for x
   x = 1,199,739,061.53/42,506.31
6. Step 6: Final answer
   x = 28,224.96