Finding the Fourth Proportional to 139,105,730.08, 208,659,314.94 and 81,557,644.96

Step by Step Solution

1. Step 1: Write the proportion equation
   139,105,730.08 : 208,659,314.94 = 81,557,644.96 : x
2. Step 2: Convert to fraction form
   139,105,730.08/208,659,314.94 = 81,557,644.96/x
3. Step 3: Cross multiply
   139,105,730.08x = 208,659,314.94 × 81,557,644.96
4. Step 4: Simplify right side
   139,105,730.08x = 17,017,762,325,473,342
5. Step 5: Solve for x
   x = 17,017,762,325,473,342/139,105,730.08
6. Step 6: Final answer
   x = 122,336,889.47