Finding the Fourth Proportional to 65,009.30, 91,209.85 and 65,009.30

Step by Step Solution

1. Step 1: Write the proportion equation
   65,009.30 : 91,209.85 = 65,009.30 : x
2. Step 2: Convert to fraction form
   65,009.30/91,209.85 = 65,009.30/x
3. Step 3: Cross multiply
   65,009.30x = 91,209.85 × 65,009.30
4. Step 4: Simplify right side
   65,009.30x = 5,929,488,501.61
5. Step 5: Solve for x
   x = 5,929,488,501.61/65,009.30
6. Step 6: Final answer
   x = 91,209.85