Finding the Fourth Proportional to 76,402, 105,435.57 and 42,868

Step by Step Solution

1. Step 1: Write the proportion equation
   76,402 : 105,435.57 = 42,868 : x
2. Step 2: Convert to fraction form
   76,402/105,435.57 = 42,868/x
3. Step 3: Cross multiply
   76,402x = 105,435.57 × 42,868
4. Step 4: Simplify right side
   76,402x = 4,519,812,014.76
5. Step 5: Solve for x
   x = 4,519,812,014.76/76,402
6. Step 6: Final answer
   x = 59,158.29