Finding the Fourth Proportional to 135,357, 186,877.38 and 86,978.52

Step by Step Solution

1. Step 1: Write the proportion equation
   135,357 : 186,877.38 = 86,978.52 : x
2. Step 2: Convert to fraction form
   135,357/186,877.38 = 86,978.52/x
3. Step 3: Cross multiply
   135,357x = 186,877.38 × 86,978.52
4. Step 4: Simplify right side
   135,357x = 16,254,317,933.88
5. Step 5: Solve for x
   x = 16,254,317,933.88/135,357
6. Step 6: Final answer
   x = 120,084.80