Finding the Fourth Proportional to 100,929.34, 139,288.71 and 56,217.34

Step by Step Solution

1. Step 1: Write the proportion equation
   100,929.34 : 139,288.71 = 56,217.34 : x
2. Step 2: Convert to fraction form
   100,929.34/139,288.71 = 56,217.34/x
3. Step 3: Cross multiply
   100,929.34x = 139,288.71 × 56,217.34
4. Step 4: Simplify right side
   100,929.34x = 7,830,440,768.23
5. Step 5: Solve for x
   x = 7,830,440,768.23/100,929.34
6. Step 6: Final answer
   x = 77,583.39