Finding the Fourth Proportional to 76,293, 105,285.61 and 42,302.91

Step by Step Solution

1. Step 1: Write the proportion equation
   76,293 : 105,285.61 = 42,302.91 : x
2. Step 2: Convert to fraction form
   76,293/105,285.61 = 42,302.91/x
3. Step 3: Cross multiply
   76,293x = 105,285.61 × 42,302.91
4. Step 4: Simplify right side
   76,293x = 4,453,888,131.82
5. Step 5: Solve for x
   x = 4,453,888,131.82/76,293
6. Step 6: Final answer
   x = 58,378.73