Finding the Fourth Proportional to 105,663.46, 145,830.52 and 65,390.19

Step by Step Solution

1. Step 1: Write the proportion equation
   105,663.46 : 145,830.52 = 65,390.19 : x
2. Step 2: Convert to fraction form
   105,663.46/145,830.52 = 65,390.19/x
3. Step 3: Cross multiply
   105,663.46x = 145,830.52 × 65,390.19
4. Step 4: Simplify right side
   105,663.46x = 9,535,884,681.45
5. Step 5: Solve for x
   x = 9,535,884,681.45/105,663.46
6. Step 6: Final answer
   x = 90,247.71