Finding the Fourth Proportional to 78,111.20, 117,142.59 and 28,184.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,111.20 : 117,142.59 = 28,184.81 : x
2. Step 2: Convert to fraction form
   78,111.20/117,142.59 = 28,184.81/x
3. Step 3: Cross multiply
   78,111.20x = 117,142.59 × 28,184.81
4. Step 4: Simplify right side
   78,111.20x = 3,301,641,642.06
5. Step 5: Solve for x
   x = 3,301,641,642.06/78,111.20
6. Step 6: Final answer
   x = 42,268.48