Finding the Fourth Proportional to 101,382.78, 139,900.74 and 56,061.36

Step by Step Solution

1. Step 1: Write the proportion equation
   101,382.78 : 139,900.74 = 56,061.36 : x
2. Step 2: Convert to fraction form
   101,382.78/139,900.74 = 56,061.36/x
3. Step 3: Cross multiply
   101,382.78x = 139,900.74 × 56,061.36
4. Step 4: Simplify right side
   101,382.78x = 7,843,025,749.41
5. Step 5: Solve for x
   x = 7,843,025,749.41/101,382.78
6. Step 6: Final answer
   x = 77,360.53