Finding the Fourth Proportional to 105,721.20, 145,902 and 69,848.28

Step by Step Solution

1. Step 1: Write the proportion equation
   105,721.20 : 145,902 = 69,848.28 : x
2. Step 2: Convert to fraction form
   105,721.20/145,902 = 69,848.28/x
3. Step 3: Cross multiply
   105,721.20x = 145,902 × 69,848.28
4. Step 4: Simplify right side
   105,721.20x = 10,191,003,748.56
5. Step 5: Solve for x
   x = 10,191,003,748.56/105,721.20
6. Step 6: Final answer
   x = 96,395.08