Finding the Fourth Proportional to 78,075.42, 117,041.36 and 28,143.30

Step by Step Solution

1. Step 1: Write the proportion equation
   78,075.42 : 117,041.36 = 28,143.30 : x
2. Step 2: Convert to fraction form
   78,075.42/117,041.36 = 28,143.30/x
3. Step 3: Cross multiply
   78,075.42x = 117,041.36 × 28,143.30
4. Step 4: Simplify right side
   78,075.42x = 3,293,930,106.89
5. Step 5: Solve for x
   x = 3,293,930,106.89/78,075.42
6. Step 6: Final answer
   x = 42,189.08