Finding the Fourth Proportional to 86,061.60, 128,982.44 and 69,429.47

Step by Step Solution

1. Step 1: Write the proportion equation
   86,061.60 : 128,982.44 = 69,429.47 : x
2. Step 2: Convert to fraction form
   86,061.60/128,982.44 = 69,429.47/x
3. Step 3: Cross multiply
   86,061.60x = 128,982.44 × 69,429.47
4. Step 4: Simplify right side
   86,061.60x = 8,955,182,448.51
5. Step 5: Solve for x
   x = 8,955,182,448.51/86,061.60
6. Step 6: Final answer
   x = 104,055.50