Finding the Fourth Proportional to 85,538.50, 128,308.20 and 23,209

Step by Step Solution

1. Step 1: Write the proportion equation
   85,538.50 : 128,308.20 = 23,209 : x
2. Step 2: Convert to fraction form
   85,538.50/128,308.20 = 23,209/x
3. Step 3: Cross multiply
   85,538.50x = 128,308.20 × 23,209
4. Step 4: Simplify right side
   85,538.50x = 2,977,905,013.80
5. Step 5: Solve for x
   x = 2,977,905,013.80/85,538.50
6. Step 6: Final answer
   x = 34,813.62