Finding the Fourth Proportional to 31,618.01, 43,641.94 and 20,870.73

Step by Step Solution

1. Step 1: Write the proportion equation
   31,618.01 : 43,641.94 = 20,870.73 : x
2. Step 2: Convert to fraction form
   31,618.01/43,641.94 = 20,870.73/x
3. Step 3: Cross multiply
   31,618.01x = 43,641.94 × 20,870.73
4. Step 4: Simplify right side
   31,618.01x = 910,838,928.21
5. Step 5: Solve for x
   x = 910,838,928.21/31,618.01
6. Step 6: Final answer
   x = 28,807.60