Finding the Fourth Proportional to 78,510.72, 117,812.21 and 28,593.81

Step by Step Solution

1. Step 1: Write the proportion equation
   78,510.72 : 117,812.21 = 28,593.81 : x
2. Step 2: Convert to fraction form
   78,510.72/117,812.21 = 28,593.81/x
3. Step 3: Cross multiply
   78,510.72x = 117,812.21 × 28,593.81
4. Step 4: Simplify right side
   78,510.72x = 3,368,699,805.45
5. Step 5: Solve for x
   x = 3,368,699,805.45/78,510.72
6. Step 6: Final answer
   x = 42,907.51