Finding the Fourth Proportional to 68,697.98, 103,061.79 and 21,312.15

Step by Step Solution

1. Step 1: Write the proportion equation
   68,697.98 : 103,061.79 = 21,312.15 : x
2. Step 2: Convert to fraction form
   68,697.98/103,061.79 = 21,312.15/x
3. Step 3: Cross multiply
   68,697.98x = 103,061.79 × 21,312.15
4. Step 4: Simplify right side
   68,697.98x = 2,196,468,327.75
5. Step 5: Solve for x
   x = 2,196,468,327.75/68,697.98
6. Step 6: Final answer
   x = 31,972.82