Finding the Fourth Proportional to 101,089.69, 139,503.77 and 56,377.69

Step by Step Solution

1. Step 1: Write the proportion equation
   101,089.69 : 139,503.77 = 56,377.69 : x
2. Step 2: Convert to fraction form
   101,089.69/139,503.77 = 56,377.69/x
3. Step 3: Cross multiply
   101,089.69x = 139,503.77 × 56,377.69
4. Step 4: Simplify right side
   101,089.69x = 7,864,899,879.66
5. Step 5: Solve for x
   x = 7,864,899,879.66/101,089.69
6. Step 6: Final answer
   x = 77,801.21