Finding the Fourth Proportional to 77,890.40, 107,488.72 and 42,080.44

Step by Step Solution

1. Step 1: Write the proportion equation
   77,890.40 : 107,488.72 = 42,080.44 : x
2. Step 2: Convert to fraction form
   77,890.40/107,488.72 = 42,080.44/x
3. Step 3: Cross multiply
   77,890.40x = 107,488.72 × 42,080.44
4. Step 4: Simplify right side
   77,890.40x = 4,523,172,632.64
5. Step 5: Solve for x
   x = 4,523,172,632.64/77,890.40
6. Step 6: Final answer
   x = 58,070.99