Finding the Fourth Proportional to 85,665.64, 128,429.18 and 35,783.94

Step by Step Solution

1. Step 1: Write the proportion equation
   85,665.64 : 128,429.18 = 35,783.94 : x
2. Step 2: Convert to fraction form
   85,665.64/128,429.18 = 35,783.94/x
3. Step 3: Cross multiply
   85,665.64x = 128,429.18 × 35,783.94
4. Step 4: Simplify right side
   85,665.64x = 4,595,702,071.37
5. Step 5: Solve for x
   x = 4,595,702,071.37/85,665.64
6. Step 6: Final answer
   x = 53,646.97