Finding the Fourth Proportional to 71,898.89, 107,848.60 and 21,978.79

Step by Step Solution

1. Step 1: Write the proportion equation
   71,898.89 : 107,848.60 = 21,978.79 : x
2. Step 2: Convert to fraction form
   71,898.89/107,848.60 = 21,978.79/x
3. Step 3: Cross multiply
   71,898.89x = 107,848.60 × 21,978.79
4. Step 4: Simplify right side
   71,898.89x = 2,370,381,406.63
5. Step 5: Solve for x
   x = 2,370,381,406.63/71,898.89
6. Step 6: Final answer
   x = 32,968.26