Finding the Fourth Proportional to 307,558.61, 461,284.71 and 139,039.74

Step by Step Solution

1. Step 1: Write the proportion equation
   307,558.61 : 461,284.71 = 139,039.74 : x
2. Step 2: Convert to fraction form
   307,558.61/461,284.71 = 139,039.74/x
3. Step 3: Cross multiply
   307,558.61x = 461,284.71 × 139,039.74
4. Step 4: Simplify right side
   307,558.61x = 64,136,906,144.38
5. Step 5: Solve for x
   x = 64,136,906,144.38/307,558.61
6. Step 6: Final answer
   x = 208,535.56