Finding the Fourth Proportional to 139,099.84, 208,649.76 and 65,210.56

Step by Step Solution

1. Step 1: Write the proportion equation
   139,099.84 : 208,649.76 = 65,210.56 : x
2. Step 2: Convert to fraction form
   139,099.84/208,649.76 = 65,210.56/x
3. Step 3: Cross multiply
   139,099.84x = 208,649.76 × 65,210.56
4. Step 4: Simplify right side
   139,099.84x = 13,606,167,693.47
5. Step 5: Solve for x
   x = 13,606,167,693.47/139,099.84
6. Step 6: Final answer
   x = 97,815.84