Finding the Fourth Proportional to 30,693.18, 42,376.06 and 21,018.83

Step by Step Solution

1. Step 1: Write the proportion equation
   30,693.18 : 42,376.06 = 21,018.83 : x
2. Step 2: Convert to fraction form
   30,693.18/42,376.06 = 21,018.83/x
3. Step 3: Cross multiply
   30,693.18x = 42,376.06 × 21,018.83
4. Step 4: Simplify right side
   30,693.18x = 890,695,201.21
5. Step 5: Solve for x
   x = 890,695,201.21/30,693.18
6. Step 6: Final answer
   x = 29,019.32