Finding the Fourth Proportional to 156,458.89, 215,904.23 and 91,918.09

Step by Step Solution

1. Step 1: Write the proportion equation
   156,458.89 : 215,904.23 = 91,918.09 : x
2. Step 2: Convert to fraction form
   156,458.89/215,904.23 = 91,918.09/x
3. Step 3: Cross multiply
   156,458.89x = 215,904.23 × 91,918.09
4. Step 4: Simplify right side
   156,458.89x = 19,845,505,116.54
5. Step 5: Solve for x
   x = 19,845,505,116.54/156,458.89
6. Step 6: Final answer
   x = 126,841.66