Finding the Fourth Proportional to 105,789.63, 145,978.88 and 63,347.07

Step by Step Solution

1. Step 1: Write the proportion equation
   105,789.63 : 145,978.88 = 63,347.07 : x
2. Step 2: Convert to fraction form
   105,789.63/145,978.88 = 63,347.07/x
3. Step 3: Cross multiply
   105,789.63x = 145,978.88 × 63,347.07
4. Step 4: Simplify right side
   105,789.63x = 9,247,334,013.15
5. Step 5: Solve for x
   x = 9,247,334,013.15/105,789.63
6. Step 6: Final answer
   x = 87,412.48