Finding the Fourth Proportional to 65,910.10, 91,105.50 and 60,678.76

Step by Step Solution

1. Step 1: Write the proportion equation
   65,910.10 : 91,105.50 = 60,678.76 : x
2. Step 2: Convert to fraction form
   65,910.10/91,105.50 = 60,678.76/x
3. Step 3: Cross multiply
   65,910.10x = 91,105.50 × 60,678.76
4. Step 4: Simplify right side
   65,910.10x = 5,528,168,769.18
5. Step 5: Solve for x
   x = 5,528,168,769.18/65,910.10
6. Step 6: Final answer
   x = 83,874.38