Finding the Fourth Proportional to 100,846.72, 139,167.12 and 56,134.72

Step by Step Solution

1. Step 1: Write the proportion equation
   100,846.72 : 139,167.12 = 56,134.72 : x
2. Step 2: Convert to fraction form
   100,846.72/139,167.12 = 56,134.72/x
3. Step 3: Cross multiply
   100,846.72x = 139,167.12 × 56,134.72
4. Step 4: Simplify right side
   100,846.72x = 7,812,107,314.41
5. Step 5: Solve for x
   x = 7,812,107,314.41/100,846.72
6. Step 6: Final answer
   x = 77,465.16