Finding the Fourth Proportional to 78,109.20, 117,139.59 and 28,182.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,109.20 : 117,139.59 = 28,182.81 : x
2. Step 2: Convert to fraction form
   78,109.20/117,139.59 = 28,182.81/x
3. Step 3: Cross multiply
   78,109.20x = 117,139.59 × 28,182.81
4. Step 4: Simplify right side
   78,109.20x = 3,301,322,808.45
5. Step 5: Solve for x
   x = 3,301,322,808.45/78,109.20
6. Step 6: Final answer
   x = 42,265.48