Finding the Fourth Proportional to 127,978.10, 191,965.35 and 57,857.30

Step by Step Solution

1. Step 1: Write the proportion equation
   127,978.10 : 191,965.35 = 57,857.30 : x
2. Step 2: Convert to fraction form
   127,978.10/191,965.35 = 57,857.30/x
3. Step 3: Cross multiply
   127,978.10x = 191,965.35 × 57,857.30
4. Step 4: Simplify right side
   127,978.10x = 11,106,596,844.56
5. Step 5: Solve for x
   x = 11,106,596,844.56/127,978.10
6. Step 6: Final answer
   x = 86,785.14