Finding the Fourth Proportional to 100,881, 139,225.50 and 56,169

Step by Step Solution

1. Step 1: Write the proportion equation
   100,881 : 139,225.50 = 56,169 : x
2. Step 2: Convert to fraction form
   100,881/139,225.50 = 56,169/x
3. Step 3: Cross multiply
   100,881x = 139,225.50 × 56,169
4. Step 4: Simplify right side
   100,881x = 7,820,157,109.50
5. Step 5: Solve for x
   x = 7,820,157,109.50/100,881
6. Step 6: Final answer
   x = 77,518.63