Finding the Fourth Proportional to 105,278.06, 145,437.39 and 91,106.30

Step by Step Solution

1. Step 1: Write the proportion equation
   105,278.06 : 145,437.39 = 91,106.30 : x
2. Step 2: Convert to fraction form
   105,278.06/145,437.39 = 91,106.30/x
3. Step 3: Cross multiply
   105,278.06x = 145,437.39 × 91,106.30
4. Step 4: Simplify right side
   105,278.06x = 13,250,262,848.15
5. Step 5: Solve for x
   x = 13,250,262,848.15/105,278.06
6. Step 6: Final answer
   x = 125,859.68