Finding the Fourth Proportional to 61,241.55, 91,870.70 and 21,789.15

Step by Step Solution

1. Step 1: Write the proportion equation
   61,241.55 : 91,870.70 = 21,789.15 : x
2. Step 2: Convert to fraction form
   61,241.55/91,870.70 = 21,789.15/x
3. Step 3: Cross multiply
   61,241.55x = 91,870.70 × 21,789.15
4. Step 4: Simplify right side
   61,241.55x = 2,001,784,353.96
5. Step 5: Solve for x
   x = 2,001,784,353.96/61,241.55
6. Step 6: Final answer
   x = 32,686.70