Finding the Fourth Proportional to 139,238.71, 208,577.16 and 64,254.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139,238.71 : 208,577.16 = 64,254.69 : x
2. Step 2: Convert to fraction form
   139,238.71/208,577.16 = 64,254.69/x
3. Step 3: Cross multiply
   139,238.71x = 208,577.16 × 64,254.69
4. Step 4: Simplify right side
   139,238.71x = 13,402,060,756.88
5. Step 5: Solve for x
   x = 13,402,060,756.88/139,238.71
6. Step 6: Final answer
   x = 96,252.41