Finding the Fourth Proportional to 76,291.90, 105,281.72 and 42,300.45

Step by Step Solution

1. Step 1: Write the proportion equation
   76,291.90 : 105,281.72 = 42,300.45 : x
2. Step 2: Convert to fraction form
   76,291.90/105,281.72 = 42,300.45/x
3. Step 3: Cross multiply
   76,291.90x = 105,281.72 × 42,300.45
4. Step 4: Simplify right side
   76,291.90x = 4,453,464,613.94
5. Step 5: Solve for x
   x = 4,453,464,613.94/76,291.90
6. Step 6: Final answer
   x = 58,374.02