Finding the Fourth Proportional to 78,488.55, 117,661.61 and 28,533.36

Step by Step Solution

1. Step 1: Write the proportion equation
   78,488.55 : 117,661.61 = 28,533.36 : x
2. Step 2: Convert to fraction form
   78,488.55/117,661.61 = 28,533.36/x
3. Step 3: Cross multiply
   78,488.55x = 117,661.61 × 28,533.36
4. Step 4: Simplify right side
   78,488.55x = 3,357,281,076.31
5. Step 5: Solve for x
   x = 3,357,281,076.31/78,488.55
6. Step 6: Final answer
   x = 42,774.15