Finding the Fourth Proportional to 78,105.32, 117,133.76 and 28,178.93

Step by Step Solution

1. Step 1: Write the proportion equation
   78,105.32 : 117,133.76 = 28,178.93 : x
2. Step 2: Convert to fraction form
   78,105.32/117,133.76 = 28,178.93/x
3. Step 3: Cross multiply
   78,105.32x = 117,133.76 × 28,178.93
4. Step 4: Simplify right side
   78,105.32x = 3,300,704,386.96
5. Step 5: Solve for x
   x = 3,300,704,386.96/78,105.32
6. Step 6: Final answer
   x = 42,259.66