Finding the Fourth Proportional to 139,126.31, 208,518.45 and 64,142.38

Step by Step Solution

1. Step 1: Write the proportion equation
   139,126.31 : 208,518.45 = 64,142.38 : x
2. Step 2: Convert to fraction form
   139,126.31/208,518.45 = 64,142.38/x
3. Step 3: Cross multiply
   139,126.31x = 208,518.45 × 64,142.38
4. Step 4: Simplify right side
   139,126.31x = 13,374,869,656.91
5. Step 5: Solve for x
   x = 13,374,869,656.91/139,126.31
6. Step 6: Final answer
   x = 96,134.73