Finding the Fourth Proportional to 78,036.66, 107,689.80 and 42,225.90

Step by Step Solution

1. Step 1: Write the proportion equation
   78,036.66 : 107,689.80 = 42,225.90 : x
2. Step 2: Convert to fraction form
   78,036.66/107,689.80 = 42,225.90/x
3. Step 3: Cross multiply
   78,036.66x = 107,689.80 × 42,225.90
4. Step 4: Simplify right side
   78,036.66x = 4,547,298,725.82
5. Step 5: Solve for x
   x = 4,547,298,725.82/78,036.66
6. Step 6: Final answer
   x = 58,271.31