Finding the Fourth Proportional to 76,303.53, 105,297.78 and 42,312.09

Step by Step Solution

1. Step 1: Write the proportion equation
   76,303.53 : 105,297.78 = 42,312.09 : x
2. Step 2: Convert to fraction form
   76,303.53/105,297.78 = 42,312.09/x
3. Step 3: Cross multiply
   76,303.53x = 105,297.78 × 42,312.09
4. Step 4: Simplify right side
   76,303.53x = 4,455,369,144.16
5. Step 5: Solve for x
   x = 4,455,369,144.16/76,303.53
6. Step 6: Final answer
   x = 58,390.08