Finding the Fourth Proportional to 85,410.59, 128,030.12 and 29,212.28

Step by Step Solution

1. Step 1: Write the proportion equation
   85,410.59 : 128,030.12 = 29,212.28 : x
2. Step 2: Convert to fraction form
   85,410.59/128,030.12 = 29,212.28/x
3. Step 3: Cross multiply
   85,410.59x = 128,030.12 × 29,212.28
4. Step 4: Simplify right side
   85,410.59x = 3,740,051,517.32
5. Step 5: Solve for x
   x = 3,740,051,517.32/85,410.59
6. Step 6: Final answer
   x = 43,789.09