Finding the Fourth Proportional to 139,071.78, 208,636.72 and 45,570.18

Step by Step Solution

1. Step 1: Write the proportion equation
   139,071.78 : 208,636.72 = 45,570.18 : x
2. Step 2: Convert to fraction form
   139,071.78/208,636.72 = 45,570.18/x
3. Step 3: Cross multiply
   139,071.78x = 208,636.72 × 45,570.18
4. Step 4: Simplify right side
   139,071.78x = 9,507,612,885.01
5. Step 5: Solve for x
   x = 9,507,612,885.01/139,071.78
6. Step 6: Final answer
   x = 68,364.79