Finding the Fourth Proportional to 42,172.26, 63,269.34 and 12,590.10

Step by Step Solution

1. Step 1: Write the proportion equation
   42,172.26 : 63,269.34 = 12,590.10 : x
2. Step 2: Convert to fraction form
   42,172.26/63,269.34 = 12,590.10/x
3. Step 3: Cross multiply
   42,172.26x = 63,269.34 × 12,590.10
4. Step 4: Simplify right side
   42,172.26x = 796,567,317.53
5. Step 5: Solve for x
   x = 796,567,317.53/42,172.26
6. Step 6: Final answer
   x = 18,888.42