Finding the Fourth Proportional to 78,012.51, 116,947.68 and 28,080.87

Step by Step Solution

1. Step 1: Write the proportion equation
   78,012.51 : 116,947.68 = 28,080.87 : x
2. Step 2: Convert to fraction form
   78,012.51/116,947.68 = 28,080.87/x
3. Step 3: Cross multiply
   78,012.51x = 116,947.68 × 28,080.87
4. Step 4: Simplify right side
   78,012.51x = 3,283,992,598.88
5. Step 5: Solve for x
   x = 3,283,992,598.88/78,012.51
6. Step 6: Final answer
   x = 42,095.72