Finding the Fourth Proportional to 151,510.84, 209,080.92 and 86,978.20

Step by Step Solution

1. Step 1: Write the proportion equation
   151,510.84 : 209,080.92 = 86,978.20 : x
2. Step 2: Convert to fraction form
   151,510.84/209,080.92 = 86,978.20/x
3. Step 3: Cross multiply
   151,510.84x = 209,080.92 × 86,978.20
4. Step 4: Simplify right side
   151,510.84x = 18,185,482,075.94
5. Step 5: Solve for x
   x = 18,185,482,075.94/151,510.84
6. Step 6: Final answer
   x = 120,027.60