Finding the Fourth Proportional to 105,503.61, 145,596.79 and 65,216.34

Step by Step Solution

1. Step 1: Write the proportion equation
   105,503.61 : 145,596.79 = 65,216.34 : x
2. Step 2: Convert to fraction form
   105,503.61/145,596.79 = 65,216.34/x
3. Step 3: Cross multiply
   105,503.61x = 145,596.79 × 65,216.34
4. Step 4: Simplify right side
   105,503.61x = 9,495,289,841.07
5. Step 5: Solve for x
   x = 9,495,289,841.07/105,503.61
6. Step 6: Final answer
   x = 89,999.66