Finding the Fourth Proportional to 139,077.10, 208,567.05 and 72,495.10

Step by Step Solution

1. Step 1: Write the proportion equation
   139,077.10 : 208,567.05 = 72,495.10 : x
2. Step 2: Convert to fraction form
   139,077.10/208,567.05 = 72,495.10/x
3. Step 3: Cross multiply
   139,077.10x = 208,567.05 × 72,495.10
4. Step 4: Simplify right side
   139,077.10x = 15,120,089,146.46
5. Step 5: Solve for x
   x = 15,120,089,146.46/139,077.10
6. Step 6: Final answer
   x = 108,717.32