Finding the Fourth Proportional to 42,690.30, 63,983.58 and 30,213.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,690.30 : 63,983.58 = 30,213.96 : x
2. Step 2: Convert to fraction form
   42,690.30/63,983.58 = 30,213.96/x
3. Step 3: Cross multiply
   42,690.30x = 63,983.58 × 30,213.96
4. Step 4: Simplify right side
   42,690.30x = 1,933,197,326.78
5. Step 5: Solve for x
   x = 1,933,197,326.78/42,690.30
6. Step 6: Final answer
   x = 45,284.23