Finding the Fourth Proportional to 91,808,112.55, 137,787,456.30 and 91,090,667.20

Step by Step Solution

1. Step 1: Write the proportion equation
   91,808,112.55 : 137,787,456.30 = 91,090,667.20 : x
2. Step 2: Convert to fraction form
   91,808,112.55/137,787,456.30 = 91,090,667.20/x
3. Step 3: Cross multiply
   91,808,112.55x = 137,787,456.30 × 91,090,667.20
4. Step 4: Simplify right side
   91,808,112.55x = 12,551,151,326,157,844
5. Step 5: Solve for x
   x = 12,551,151,326,157,844/91,808,112.55
6. Step 6: Final answer
   x = 136,710,699.93