Finding the Fourth Proportional to 42,688.29, 63,980.58 and 30,211.96

Step by Step Solution

1. Step 1: Write the proportion equation
   42,688.29 : 63,980.58 = 30,211.96 : x
2. Step 2: Convert to fraction form
   42,688.29/63,980.58 = 30,211.96/x
3. Step 3: Cross multiply
   42,688.29x = 63,980.58 × 30,211.96
4. Step 4: Simplify right side
   42,688.29x = 1,932,978,723.74
5. Step 5: Solve for x
   x = 1,932,978,723.74/42,688.29
6. Step 6: Final answer
   x = 45,281.24