Finding the Fourth Proportional to 42,178.22, 63,298.63 and 19,991.64

Step by Step Solution

1. Step 1: Write the proportion equation
   42,178.22 : 63,298.63 = 19,991.64 : x
2. Step 2: Convert to fraction form
   42,178.22/63,298.63 = 19,991.64/x
3. Step 3: Cross multiply
   42,178.22x = 63,298.63 × 19,991.64
4. Step 4: Simplify right side
   42,178.22x = 1,265,443,685.81
5. Step 5: Solve for x
   x = 1,265,443,685.81/42,178.22
6. Step 6: Final answer
   x = 30,002.30