Finding the Fourth Proportional to 139,044.72, 191,779.79 and 91,280.64

Step by Step Solution

1. Step 1: Write the proportion equation
   139,044.72 : 191,779.79 = 91,280.64 : x
2. Step 2: Convert to fraction form
   139,044.72/191,779.79 = 91,280.64/x
3. Step 3: Cross multiply
   139,044.72x = 191,779.79 × 91,280.64
4. Step 4: Simplify right side
   139,044.72x = 17,505,781,970.27
5. Step 5: Solve for x
   x = 17,505,781,970.27/139,044.72
6. Step 6: Final answer
   x = 125,900.37