Finding the Fourth Proportional to 60,990.82, 91,463.47 and 20,998.50

Step by Step Solution

1. Step 1: Write the proportion equation
   60,990.82 : 91,463.47 = 20,998.50 : x
2. Step 2: Convert to fraction form
   60,990.82/91,463.47 = 20,998.50/x
3. Step 3: Cross multiply
   60,990.82x = 91,463.47 × 20,998.50
4. Step 4: Simplify right side
   60,990.82x = 1,920,596,025.77
5. Step 5: Solve for x
   x = 1,920,596,025.77/60,990.82
6. Step 6: Final answer
   x = 31,489.92