Finding the Fourth Proportional to 86,985, 119,139.84 and 81,878.40

Step by Step Solution

1. Step 1: Write the proportion equation
   86,985 : 119,139.84 = 81,878.40 : x
2. Step 2: Convert to fraction form
   86,985/119,139.84 = 81,878.40/x
3. Step 3: Cross multiply
   86,985x = 119,139.84 × 81,878.40
4. Step 4: Simplify right side
   86,985x = 9,754,979,475.46
5. Step 5: Solve for x
   x = 9,754,979,475.46/86,985
6. Step 6: Final answer
   x = 112,145.54