Finding the Fourth Proportional to 42,448.83, 63,680.93 and 13,987.30

Step by Step Solution

1. Step 1: Write the proportion equation
   42,448.83 : 63,680.93 = 13,987.30 : x
2. Step 2: Convert to fraction form
   42,448.83/63,680.93 = 13,987.30/x
3. Step 3: Cross multiply
   42,448.83x = 63,680.93 × 13,987.30
4. Step 4: Simplify right side
   42,448.83x = 890,724,272.19
5. Step 5: Solve for x
   x = 890,724,272.19/42,448.83
6. Step 6: Final answer
   x = 20,983.48